Stone-drilling machine.



No. 882,805. PATENTED MAR. 24, 1908. A. WEISS & E. NAGEL.

STONE DRILLING MACHINE.

APPLICATION FILED MAY 22, 1907.

UNITED STATES PATENT OFFICE.

ADOLF WEISS AND EMIL NAGEL, OF FREDEBICKSBURG, TEXAS.

STONE-DRILLING MACHINE.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed May 22, 1907. Serial. No. 375,032.

reference being had to the accompanying drawings, forming a part hereof.

Our invention has relation. to improvements in stone-drills; and it consists in the novel construction and arrangement of parts more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1'is a side elevation of the drill; Fig. 2 is a horizontal section on the line 2-2 of Fig. 1 and Fig. 3 is an enlarged transverse vertical section on line 3-3 of Fig. 2.

The object of our invention is to construct a machine for drilling granite, marble and stone generally to the tool of which water will be automatically fed during the drilling operation; one which will require a minimum effort to operate, and one possessing further and other advantages better apparent from a detailed description thereof which is as follows:

Referring to the drawings, F represents a suitable frame having basal lugs 1, 1, provided with screws 2 for securing the same to any suitable support. Mounted in suitable bracket arms 3, 3, at the free end of the frame is a rock-shaft 4 provided with a central laterally projecting arm 5 from the end of which depends pivotally a link 6 whose lower end is coupled pivotally to the adjacent end of a pedal bar 7 provided with a foot rest 8. The pedal 7 is hinged at a convenient point near the base of the frame F. The rear end of the rock-shaft 4 terminates in an arm 9 which is loosely coupled to the upper end of a vertically reciprocating connecting rod 10 passing loosely through guide-brackets 11, the rod being normally depressed by a spring 12 confined between the brackets, one end of the spring bearing against the upper bracket, and the lower against a fixed collar 13 carried by the rod. The lower end of the rod 10 is pivotally coupled to the end of a crank-arm 14 at the end of the spindle 15 of an ordinary rock-valve confined in the valvecasing 16 communicating with an outlet tube 17 leading from the bottom of a water tank A supported on a plate 18 resting on legs 19 the plate 18 being cou led in any mechanical manner to the genera supporting frame F.

Leading from the valve-casing 16 is a spout 20 which discharges the water to the cutter of the tool t. The tool-shank is loosely mounted in bearings 21, 21 identified with the main frame, the upper extension t of the shank bemg polygonal or square 1n cross section and receiving the blows of the sledge whlch drives the cutter into the stone being drilled. The

tool is normally held disengaged from the surface operated on, by an expanding spring 22 one end of which bears against the ring or boss 23 formed on the plate 18, the upper end of the spring bearing against a collar 24 carried by the tool-shank.

Carried at the outer end of the shaft 4 is an arm or lug 25 to which is secured an advancing pawl 26, said pawl engaging the teeth of ahorizontally rotatable ratchet disk 27 loosel secured to the extension t of the tooshank. To prevent accidental backward rotation of the parts a locking pawl or checkpawl 28 is conveniently mounted on the frame. The locking pawl too, holds the ratchet 27 to its bearing 21 during the vertical reciprocations which the tool-shank necessarily partakes of under the blows of the sledge in. one direction, and the spring 22 in the opposite direction in the operation of the machine. S, represents a seat for the operator.

The operation is as follows: The operator seated on the seat S operates the pedal 8 thereby imparting a rocking motion to the shaft 4 as is obvious, the arm 5 being depressed with a downward movement of the pedal, and automatically rising to its return position under the action of the spring 12 which through the collar 13 is virtually coupled to the arm 9 pointing in a direction opposite to the arm 5. So that as arm 5 is depressed, the arm 9 is raised, the latter through the connections described rocking the stem 1.5 of the water-cock or valve and allowing the water to escape from the tank A through the spout 20 to the cutter of the tool If. With each oscillation of the shaft 4 the pawl 26 rotates the disk 27 and hence the tool 15. As the latter thus periodically rotates, it is struck with a sledge Whose blow is directed against the end if, and thus the drilling proceeds. Obviously, and as shown in Fig. 2 of the drawings, the disk 27, passed over the polygonal extension t of the tool, is capable of imparting rotation to said tool;

but the part t is only loosely inserted through the disk to permit the tool to partake of independent vertical movements necessarily imparted to it under the action of the sledge blows. The collar 24 of course is either keyed or shrunk on the tool 15 or secured in any well known mechanical manner and no special illustration thereof is here necessary.

Having described our invention, what we claim is:

In a drill, a suitable rotatable drilling tool,

a spring for normally disengaging the same from the surface operated on, a ratchet carried by the toolshank, a rock-shaft, a pawl coupled to the shaft and engaging the ratchet, a water tank, a spout leading from the tank to a point in proximity to the cutter of the tool, a rock-valve controlling the flow of water through the spout, a pedal coupled to the rock-shaft, a connecting-rod interposed between the rock-shaft and rock-valve, and a spring coupled to the connecting rod for actuating the same in one direction and impelling the rock-shaft in a corresponding direction, the pedal serving to actuate the shaft in the opposite direction, the parts operating substantially as, and for the pur pose set forth.

In testimony whereof we afliX our signatures, in presence of two witnesses.

ADOLF WEISS.

I EMIL NAGEL.

Witnesses:

A, W. PETMESKY, SAM KRUEGER. 

